Dual-Band Circular-Button Antenna for WBAN Applications

In this paper, a circular-button antenna suitable for wireless body area network (WBAN) is presented by considering various design challenges like size, operating frequency, bandwidth requirement, and other challenges posed by the human tissues. The proposed antenna consist of a unique circular button antenna for WBAN applications. This button shaped antenna of diameter 15.5 mm consist a top moon shaped patch on substrate with permittivity of 2.2 and a conductive ground below the textile substrate of permittivity 1.4. The antenna is designed to operate in ISM band with resonance at 2.45 GHz and 4.6-6.4 GHz (30% BW), were the lower frequency provides the gain of 2.3 dBi which can be used for communicating with other body devices and upper frequency provides gain of 5.1 dBi useful for communicating other nearby devices in same band. To hide the moon shaped patch a denim superstarte is introduced and the effect of same on antenna performance is studied under various conditions.